I've just checked this tut Make a bridge to cross water barrier
and I wondered, why not do this with the Pin behaviour?
I tested this and it worked, check it out here
So you see I pinned the bridge rails to the bridge. And whenever the Player touches a bridge rail, the bridge gets pinned to the Player.
You can attach the bridge to the Player from any point and there will be no "jump" when attaching the bridge to the Player when the Player touches the bridge rail.
One thing, though - sometimes the movement is slooooow. I supposed it had to do with the "solidity" of the guide rails (which is required for collision test in order to be able to attach the bridge to the Player).
Solution: as you can see in the event sheet, after a collision with the rails, I disabled the "Solid" behavior. Aha, now it works.
Problem which can be found here an in the original tutorial:
If the bridge is set mid-way above the river, the Player can go over the bridge and as soon as he touches the river, he's transported to the other side. No chance to get that bridge again <img src="smileys/smiley5.gif" border="0" align="middle"> Can be a feature, or it should be corrected..